Cylinder block for internal-combustion engines



1,640,761 Aug. 30, 1927. J. FEJES v CYLINDER BLOGK FOR INTERNAL COMBU$TION ENGINES Filed June 17. 1926 latented Aug. 3%),

PATENT OFFICE.

Juno scans, on BUDAPEST, HUNGARY.

CYLINDER BLOCKYFOR' INTERNAL-COMBUSTION ENGINES.

Application filed June 17,

This invention relates to an improved cylinder block for internal combustion engines of the pressed steel type, in con'tradistinction to cast cylinder blocks. Y

A cylinder block mainly consists of a cylinder body, cylinder head which is also adapted to receive the valves, guides for the valve stems, induction piping, cylinder bed plate and water jacket in the case of water cooled engines, and of all these parts so far as stresses are concerned, the bed plate is the most important component, as it has to withstand all the stresses, viz, those due to the explosion and combustion within the cylin der or cylinders as well as .those set up externally. V p

In the case of cast cylinders the bedplate is cast in one piece therewith, whilst in the case of pressed steel cylinders the bed plate has to be made separately and the cylinders have to be attached thereto in a gas-tight manner and so that the alignment of the cylinders shall be maintained and that no distortion shall be produced. The usual mechanical means are not suitable for this purpose as they are not reliable, nor sufficiently durable quite apart from their excessive cost, and welding has been found to be the only practical means of attachment provided the joint between the end of the cylinder and the bed-plate is made sufficiently strong so as to be reliable under all working conditions.

The main object of the present invention is to provide a welded cylinder block of the pressed steel type for single or multicylinder internal combustion engines, in which the alignment of the cylinders is maintained and distortion prevented in the various parts of the cylinder unit, both during the welding process when the pressed steel cylinder unit is manufactured and subsequently under working conditions.

lhis object. is attained by the provision of the following means for securing the cylinder or cylinders to the common bed plate An external shoulder is provided near the lower end of the cylinder whilst the recess in the bed plate intended to receive the cylinder is formed with a flange having an inward projection followed by. a downward projection whereby an annular recess or groove is formed between the said clownward projection and the remainder of the bed plate, the inner surface of the downward projection being tapered so that after 1926. Serial No. 116,693.

the cylinder has been inserted into the re cess with the shoulder thereof resting on the top of the bed plate and the cylinder end has been pressed out against the said tapered surface, the cylinder is locked in position, the lower edges of the said downward projection and of the lower end of the cylinder being then autogenously welded together by an oxy-acetylene flame or electrically. I

Referring to the accompanying drawings which illustrate the invention by way of example,

Figure 1 is a sectional elevation of a cylinder block composed of cylinder units connected to a common bed plate.

Figure 2 is a sectional elevation showing the connection between the cylinders and the common base plate shown on an enlarged scale, whllst Figure 3 illustrates the form of the end of the cylinder before it is widened to be.

secured to the bed plate; I

Two cylinder units are shown on the drawing, each unit comprising a cylinder at, a cylinder head I) inIwhich also the valves are accommodated, an induction pipe 0 provided with a continuation d leading to the inlet valve, an exhaust pipe 6 and guides (Z and e vfor the inlet and exhaust valve respectively. The various units are connected together to form a block the various cylinders a being connected to a common bed plate f.

According to the present invention the connection between each one of the cylinders a and the bed plate f is effected as follows The bed plate is formed with a recess 9 for each one of the cylinders and with an annular flange comprising a projection h extending internally into the recess, which projection, is followed by a downward projection i the inner surface of which is tapered as shown at An annular groove. y' is thus formed between the downward projection 71 and the remainder of the bed plate. An annular shoulder a is formed near the lower end a of thecylinder, the inner surface of the said lower end being tapered as shown at The cylinder is first placed in position with the lower end a projecting into the recess 9 and wit-h the shoulder a resting on the inwardly projecting flange it (see Figure The lower end a of the cylinder is then pressed out by means of a conical mandrel or other suitable means until its outer surface abuts against the tapered surface 2' provided on the downward projection i (see Figure 2). Finally the two lower edges 2' and a of the down ward projection and lower end of the cylinder respectively are welded together autogenously indicated at 70.

It will be seen that according to the present invention the cylinder is iirinly locked in position and that by providing the metal weld 70 at the lower edges of the downward projection 11 and'lower end ofthe cylinder whilst leaving a groove between the welding surface and the bulk of the bed plate, the heat of the welding is localized whereby distortion is avoided. The welding edges preferably lie within the recess g above the lower surface f of the bed plate whereby the welded edges are protected from injury and destruction, this arrangement also permitting the surface 7 of the bed plate to be machined without damaging the weld 7c.

.Vhat I claim is 1. A cylinder block of pressed steel for internal combustion engines comprising in v combination a cylinder, acylinder head, in-

duction piping, a bed plate, a recess in the bed plate for the reception of the cylinder and means for securing the cylinder to the bed plate, said means comprising an external shoulder near the lower end of the cylinder, a flange forming integral part with the bed plate and constituted by an inward projection and a downward projection whereby an annular recess is formed between the latter projection and the remainder of the bed plate, the inner surface of the downward projection being tapered, whereby after the cylinder end has been inserted into the recess formed in the bed plate with the shoulder resting on the top of the bed plate and the cylinder end has'been pressed out against the tapered surfacefthe cylinder is locked in position, and an outer metal weld along the edges of'the downward projection and end of the cylinder, for

the purposes set forth.

2. A cylinder block as claimed in claim 1 and in which the inner surface of the lower end of the cylinder is tapered 3. A cylinder block as clalmed n claim 1 and in WlllCh the edge of the downward )roection and the ed e of the lower end of L J a V the cylinder lie above the lower surface of the bed plate, for the purpose set forth.

In testimony whereof I have signed my name to this specification.

JENo mis; 

